feat: issue #260

Dramatically improves the usefulness of `--search` by outputting
"chunked" results. This removes the need (usually) to search and then
manually open a cheatsheet.

internal/sheet/search.go

@@ -9,21 +9,16 @@ import (
 func (s *Sheet) Search(reg *regexp.Regexp) string {
 
 	// record matches
-	matches := []string{}
+	matches := ""
 
 	// search through the cheatsheet's text line by line
-	// TODO: searching line-by-line is surely the "naive" approach. Revisit this
-	// later with an eye for performance improvements.
-	for _, line := range strings.Split(s.Text, "\n") {
+	for _, line := range strings.Split(s.Text, "\n\n") {
 
 		// exit early if the line doesn't match the regex
-		if !reg.MatchString(line) {
-			continue
+		if reg.MatchString(line) {
+			matches += line + "\n\n"
 		}
-
-		// record the match
-		matches = append(matches, line)
 	}
 
-	return strings.Join(matches, "\n")
+	return strings.TrimSpace(matches)
 }